/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Bespin.
 *
 * The Initial Developer of the Original Code is
 * Mozilla.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Bespin Team (bespin@mozilla.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

var catalog = require('bespin:plugins').catalog;
var history = require('canon:history');
var env = require('environment').env;

/**
 * The pointer to the command that we show on up|down
 */
var pointer = 0;

/**
 * CLI 'up'
 * Decrement the 'current entry' pointer
 */
exports.historyPreviousCommand = function(args, request) {
    if (pointer > 0) {
        pointer--;
    }

    var display = history.requests[pointer].typed;
    env.commandLine.setInput(display);
};

/**
 * CLI 'down'
 * Increment the 'current entry' pointer
 */
exports.historyNextCommand = function(args, request) {
    if (pointer < history.requests.length) {
        pointer++;
    }

    var display = (pointer === history.requests.length)
        ? ''
        : history.requests[pointer].typed;

    env.commandLine.setInput(display);
};

/**
 * 'history' command
 */
exports.historyCommand = function(args, request) {
    var output = [];
    output.push('<table>');
    var count = 1;

    history.requests.forEach(function(request) {
        output.push('<tr>');
        output.push('<th>' + count + '</th>');
        output.push('<td>' + request.typed + '</td>');
        output.push('</tr>');
        count++;
    });
    output.push('</table>');

    request.done(output.join(''));
};

/**
 * Reset the pointer to the latest command execution
 */
exports.addedRequestOutput = function() {
    pointer = history.requests.length;
};
